Electronic copy available at: http://ssrn.com/abstract=1873558 1 Unveiling the Growth Process of Innovation Decliners Based on Penetration Data Keren Haddad-Leibovich 1 Jacob Goldenberg 2 Daniel Shapira 3 Acknowledgments: The authors would like to thank Sourceforge.net for sharing their aggregate adoption data, and Valerie Bonstrom, CEO of Mrs. Sporty for sharing their information and marketing insights. The authors are grateful for the support by the Julian Simon Funds at the Hebrew University. We also wish to thank Barak Libai, Eitan Muller, Arvind Rangaswami, and Christophe Van den Bulte for their insightful comments. 1 Keren Haddad-Leibovich is a doctoral candidate at the School of Business Administration, Hebrew University of Jerusalem, Jerusalem 91905, Israel. Kerenya@mscc.huji.ac.il, Tel: +972-2- 5883227. 2 Jacob Goldenberg is a professor of marketing at the School of Business Administration, Hebrew University of Jerusalem, Jerusalem 91905, Israel. Msgolden@huji.ac.il, Tel: +972-2-5883226. 3 Daniel Shapira is a lecturer at the Department of Business Administration, Guilford Glazer Faculty of Business and Management, Ben-Gurion University, Beer Sheva 841205, Israel. Shapirad@bgu.ac.il, Tel: +972-8-6479792.